Water inlet structure for outboard motors



Sept. 22, 1953 CARLSQN ETAL 2,652,802

WATER INLET STRUCTURE FOR OUTBOARD MOTORS Filed April 20, 1951 2 Sheets-Sheet 1 FIE" 1 I INVENTORS Ema Ca RLSWY im/v EBE r2041? Sept. 22, 1953 B. CAIVQLSON ETAL 2,652,802

I INVEN TOR 5mm fivasa/v (TU/IN 55 TZOLD Zr i/2. a.

Patented Sept. 22, 1953 WATER. I'NIJE'I STRUCTURE FOR? GUTBOARD MOTORS- By-ron Carlson, Minneapolis, Minn. and John. E. Betzold Huntington Park Galifl, assignors to ScottFAtwater Manufacturing (Iou Ihc.,,Minneapolis, Minn.,, a. corporation of Minnesota Application April'ZO, 1951i, Serial. NO. 2223068 9' Claims. (Cl. 115-17).

invention relates to. an. outboard motor construction, and particularly to: the. structure of a casing: for an outboard motor and the cooling water inlet. of said casing.

Iliis: generally an object. of. this invention to locate a cooling water inlet of an. outboard motor casing adjacent.- the propeller so thatthe propeller will; act to: assist the entry oi water into said opening: and; casing.

It is also an object oi this invention to provide an outboard motor having a. casing, a propeller shaft journaledin the lower part. of said. casing, a. propeller secured. to. said shaft, said casing. haw ing a. portion disposed above and. adjacent said propeller and a. Water inlet opening for said. casing: disposed adjacent said propeller, said opening preferably being covered with a screen.

It is another object of. the invention toprovide anv outboard motor-structure comprising a cas ing having? a lower portion in which a: propeller shaft is. journaled; and to which. shaft a propeller is secured. in therear ofi said. lower portion; Said casing" having: a portion extending rearwardly of and above said lower portion and baring; an open-- ing therein which is disposed above and adjacent: said propeller;. a screen covering; said. opening, said; opening and screen extending rearwardly and. downwardly as: does the rear'partof the propeller blade. at its upper portion...

It; is more specifically an. object. oi. the inven 3) tion to provide an outboard motor structurecom prising acasing having an upper portion and. av lower portion. with adjacentfiat surfaces, a plate disposed between said portions and engaged respectivelyby said surfaces means: securing said. a

portions and plate rigidly together, said plate and upper portion extending rearwardly beyond-v said. lower portion, av propeller in. the rear of. said. lower portion the top. of which is adjacent said;

projecting part of said plate and upper. portion.

said plate having an opening therethrough elongated: forwardly and rearwardly and a screen covering said: opening- It is: also an. object ofv the invention to. provide: such a structure as set forthin. the preceding paragraph, including a drive shaft extending, vertically in. said casing, a hub: disposed about. said shaft, a pump chamber: extending about. said. shaft, and a passage communicating with. said pump chamber having a. vertical portion extendi-ng alongside said. hub. and a horizontal portion extending to and communicating withsaid opening.

These and other" objects and. advantages: of the: invention: will be fully set forth in the following 2 description made in connection with the accompanying drawings. in which like; reference characters refer to. similar parts throughout the several views and inv which:

l is for the most part a vertical section through the: lower portion of an outboardmotor. taken substantially centrally of the drive shaftina forward and rearward direction. a portion. being shown in side: elevation;

2 is a horizontal section taken substantially on line 22 of Fig. 1, as indicated by the arrows;

Fig. 3. is a horizontal section taken substantially on line 3-3 of. Fig. 1, as indicated by the arrows; and

Fig. 4: is a horizontal section. taken substantially on line- 4-4. of Fig... 1-,. as indicated by the arrows.

Referring to the drawings an outboard motor structureisshown comprising a. casing H3 Only the lower portion of; the casing; is. shown. which comprises an upper portion. Illa. having a lower substantially horizontal. surface: lilb and a lower portion lllc: having an upper substantially hori-- zontal surface Ltd... A plate. Illa is disposed. betweenv portions. Illa and L50. having; flat top and. bottom surfaces engaged by surfaces lllb: and Hid. The portions. Illa, we and plate Hie are rigidly secured together by a plurality of headed and nutted bolts H extending: therethrough. A propeller [.21 is disposed therear. of the lower portion too, the same being secured to a. shaft M which. will: be driven in. the. usual. manner. by a drive shaft [6 through. beveled gears l1. Plate Iile and the upper portion lfiaproject rearwardly beyond the lower portion. We and the projecting portions thereof. are disposed above. and. adjacent. the blade of propeller l2- Plate I-ile has. a. portion 19:]? adjacent its'rear. extending downwardly and said plate has an opening Lehtherethrough extending to said portion 10]; which. opening as shown. in Fig. 2. is quite elongated in a. forward and rearward. direction. Opening Lilli is covered by a. screen. I'8 secured to plate file by small headed screws. L9. Said opening Hm and screen. l8

curve downwnardly' rearwardly, which curvature preferably follows generally the curvature of. the. top of the propeller blades so that when said blades. are in vertical position said opening andscreen are substantially parallel to the curved edge of. said. blades. The upper portion Illa of the. casing has a. part [0i which forms. with platemea horizontal passage [07.. Passage. on communicates with opening lllh and extends about 3 a small hub Ink through which one of the bolts H passes and communicates with a vertical extending passage use which extends to an annular passage H372 in casing Iii which is disposed below a pump chamber mm. Pump chamber Him extends about shaft l6 and is coaxial therewith. A pump casing 28 is shown in pump chamber and a pump 22 is disposed in chamber Him, the same having a hub secured to shaft [6 in any suitable manner, as by a key 23. Annular passage [072 has an outlet portion [M3 opening into the pump chamber Him through the bottom of casing 29. Casing it has anoutlet passage Illn extending from pump chamber Him and which communicates with an upwardly extending con duit 24 carrying the cooling water to the motor.

A sleeve 26 is shown in which is movable a rod 28, which rod is connected to a gear shifting member 29. Parts 26, 23 and 29 form no part of the present invention.

Passage i571, as shown in Fig. 1, extends along one side of a hub mo in which is disposed a needle bearing 36 for shaft l6. Annular passage 1M2 extends about the upper end of hub lfio. Casing it has extending through its rear lower portion an exhaust passage lilp which also extends through the rear portion of plate llle. Said exhaust portion has an open lower end in plate we, the periphery of which is disposed in a plane extending upwardly and rearwardly from the lower end of portion I0 In operation, drive shaft It will be driven from the motor and propeller shaft i l and propeller l2 will be rotated. The propeller will cause a pressure of water which will assist in moving the water through opening lEih and through the screen 13 into passage Ilia. The opening lfih and screen 58, as stated, extend downwardly, and as stated, preferably follow generally the curvature of the propeller blade. This will assist the entry of water through screen it, particularly when the propeller is rotating in reverse. The screen 18 and opening 19h are also disposed generally between the blade of propeller l2 and the exhaust opening tsp, which is desirable. The water entering through screen [8 passes readily to the pump chamber.

From the above description it will be seen that we have provided a simple and very efficient structure of the inlet water opening and cooperating parts in an outboard motor. The screen is is nicely carried by plate ice which also has therein the inlet opening for the cooling water. The parts can be conveniently made and easily assembled.

The device has been demonstrated in actual practice, found to be very successful and efficient and is being commercially made.

It will of course be understood that various changes may be made in the form, details, arrangement and proportions of the parts, without departing from the scope of applicants invention, which generally stated, consists in a device capable of carrying out the objects above set forth, in the parts and combinations of parts disclosed and defined in the appended claims.

What is claimed is: V

1. An outboard motor structure having in combination, a casing, a propeller shaft journaled in said casing, a propeller secured to said shaft and disposed at the rear of said casing, said casing having a portion above and adjacent said propeller having an elongated opening above said propeller forming a cooling water inlet and a screen covering said opening whereby said propeller will assist in moving water through said screen and opening.

2. The structure set forth in claim 1, said propeller having blades with convexly curved end edges and said opening and screen being continuous and extending substantially horizontally above and in front of said propeller and being curved and generally following said curvature of said propeller blades in the rear thereof.

3. The structure set forth in claim 1, a driving shaft extending substantially vertically in said casing, a pump chamber extending about said shaft, a passage extending vertically adjacent said shaft communicating with said pump chamber and having a substantially horizontal portion communicating with said opening.

4. The structure set forth in claim 1, a drive shaft extending vertically in said casing, said casing having a hub through which said shaft extends, a pump chamber extending about said shaft, said casing having an annular passage below said pump chamber, a passage extending vertically at one side of said hub communicating with said annular passage and having a horizontal portion communicating with said first mentioned opening.

5. An outboard motor structure having in combination, a casing having an upper portion and a lower portion, said portions having adjacent surfaces disposed in substantially horizontal planes respectively, a plate disposed between said surfaces and engaged thereby, means for securing said portions and plate rigidly together, a substantially horizontal propeller shaft journaled in said lower portion, a propeller secured to said shaft at the rear of said casing, said plate and upper portion projecting rearwardly beyond said lower portion, said plate having an opening therethrough elongated in a forward and rearward direction, said opening forming an inlet for cooling water, a screen covering said opening, said opening and screen being disposed above and adjacent said propeller whereby said propeller will act to move water through said screen and opening.

' 6. The structure set forth in claim 5, a drive shaft extending vertically in said casing, a pump chamber extending about said drive shaft, said upper portion having a part forming with said plate a passage communicating with said opening and a passage extending upwardly at one side of said shaft communicating with said pump chamber and first mentioned passage.

7. An outboard motor structure having in combination, a casing, a drive-shaft, a propeller shaft disposed at right angles to said driveshaft and journaled in said casing, a propeller secured to said shaft and disposed at the rear of said casing, said casing having a portion above and adjacent said propeller having an elongated screened opening forming a cooling water inlet, a chamber in said casing with which said opening communicates, a pump chamber in said casing, a pump in said pump chamber secured to and rotatable with said driveshaft and a passage leading from said first mentioned chamber to said pump chamber whereby said propeller will act to cause a fiow of water through said opening.

8. The structure set forth in claim 5, said upper portion having a downwardly directed opening for exhaust gases at its rear end, a discharge spout member having an opening therethrough vertically aligned with said last mentioned opening, means securing said member to said upper portion, and means for securing said screen to said member.

9. An outboard motor comprising a drive shaft having in combination, a casing having an upper portion and a lower portion, said portions having adjacent surfaces disposed in substantially horizontal planes respectively, a plate disposed between said surfaces and engaged thereby, means for securing said portions and plate rigidly together, said casing having a third portion above said upper portion, a substantially horizontal propeller shaft journaled in said lower portion, a propeller secured to said shaft at the rear of said casing, said plate and upper portion projecting rearwardly beyond said lower portion, said plate having an opening therethrough elongated in a forward and rearward direction, said plate and upper portion forming a substantially horizontal passage leading forwardly from said opening, said upper portion having a vertically extending passage communicating with said horizontal passage, said upper portion having a pump chamber about said drive shaft and having a chamber below said pump chamber extending around said drive shaft, said vertical passage communicating with said latter chamber, a third passage leading upwardly from said pump chamber into said third portion, and a conduit communicating with said third passage extending upwardly within said third portion.

BYRON CARLSON. JOHN E. BETZOLD.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,716,962 Johnson June 11, 1929 1,786,835 Evinrude Dec. 30, 1930 1,824,737 Johnson Sept. 22, 1931 1,824,739 Johnson Sept. 22, 1931 1,931,075 Johnson Oct. 17, 1933 2,071,634 Irgens Feb. 23, 1937 2,555,548 Kiekhaefer June 5, 1951 FOREIGN PATENTS Number Country Date 48,556 Denmark Mar. 26, 1934 

